package org.apache.lucene.index;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

class SegmentTermPositionVector extends SegmentTermVector implements TermPositionVector {
    protected int[][] positions;
    protected TermVectorOffsetInfo[][] offsets;
    public static final int[] EMPTY_TERM_POS = new int[0];

    public SegmentTermPositionVector(String field, String terms[], int termFreqs[], int[][] positions, TermVectorOffsetInfo[][] offsets) {
        super(field, terms, termFreqs);
        this.offsets = offsets;
        this.positions = positions;
    }

    /**
     * Returns an array of TermVectorOffsetInfo in which the term is found.
     *
     * @param index The position in the array to get the offsets from
     * @return An array of TermVectorOffsetInfo objects or the empty list
     * @see org.apache.lucene.analysis.Token
     */
    public TermVectorOffsetInfo[] getOffsets(int index) {
        TermVectorOffsetInfo[] result = TermVectorOffsetInfo.EMPTY_OFFSET_INFO;
        if (offsets == null)
            return null;
        if (index >= 0 && index < offsets.length) {
            result = offsets[index];
        }
        return result;
    }

    /**
     * Returns an array of positions in which the term is found.
     * Terms are identified by the index at which its number appears in the
     * term String array obtained from the <code>indexOf</code> method.
     */
    public int[] getTermPositions(int index) {
        int[] result = EMPTY_TERM_POS;
        if (positions == null)
            return null;
        if (index >= 0 && index < positions.length) {
            result = positions[index];
        }

        return result;
    }
}